must interrogate
Regular verb: interrogate - interrogated- interrogated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must interrogate
you must interrogate
she must interrogate
we must interrogate
you must interrogate
they must interrogate 	I must be interrogating
you must be interrogating
she must be interrogating
we must be interrogating
you must be interrogating
they must be interrogating	I must have interrogated
you must have interrogated
she must have interrogated
we must have interrogated
you must have interrogated
they must have interrogated	I must have been interrogating
you must have been interrogating
she must have been interrogating
we must have been interrogating
you must have been interrogating
they must have been interrogating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't interrogate
you mustn't interrogate
she mustn't interrogate
we mustn't interrogate
you mustn't interrogate
they mustn't interrogate 	I mustn't be interrogating
you mustn't be interrogating
she mustn't be interrogating
we mustn't be interrogating
you mustn't be interrogating
they mustn't be interrogating	I mustn't have interrogated
you mustn't have interrogated
she mustn't have interrogated
we mustn't have interrogated
you mustn't have interrogated
they mustn't have interrogated	I mustn't have been interrogating
you mustn't have been interrogating
she mustn't have been interrogating
we mustn't have been interrogating
you mustn't have been interrogating
they mustn't have been interrogating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I interrogate?
must you interrogate?
must she interrogate?
must we interrogate?
must you interrogate?
must they interrogate? 	must I be interrogating?
must you be interrogating?
must she be interrogating?
must we be interrogating?
must you be interrogating?
must they be interrogating? 	must I have interrogated?
must you have interrogated?
must she have interrogated?
must we have interrogated?
must you have interrogated?
must they have interrogated? 	must I have been interrogating?
must you have been interrogating?
must she have been interrogating?
must we have been interrogating?
must you have been interrogating?
must they have been interrogating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I interrogate?
mustn't you interrogate?
mustn't she interrogate?
mustn't we interrogate?
mustn't you interrogate?
mustn't they interrogate? 	mustn't I be interrogating?
mustn't you be interrogating?
mustn't she be interrogating?
mustn't we be interrogating?
mustn't you be interrogating?
mustn't they be interrogating? 	mustn't I have interrogated?
mustn't you have interrogated?
mustn't she have interrogated?
mustn't we have interrogated?
mustn't you have interrogated?
mustn't they have interrogated? 	mustn't I have been interrogating?
mustn't you have been interrogating?
mustn't she have been interrogating?
mustn't we have been interrogating?
mustn't you have been interrogating?
mustn't they have been interrogating?